Fairlight Bus Sends - panning disabled

I'm trying to send a stereo track to two mono buses, panning each of them to the left/right. However, the panning knob seems to be disabled (see screenshot).
Am I doing something wrong, or is this maybe a Windows bug (W10, Resolve 17.2.1)
Thanks!
Am I doing something wrong, or is this maybe a Windows bug (W10, Resolve 17.2.1)
Thanks!